/*
 * Copyright (c) 2010 Nicolas George
 * Copyright (c) 2011 Stefano Sabatini
 * Copyright (c) 2014 Andrey Utkin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * @file
 * API example for demuxing, decoding, filtering, encoding and muxing
 * @example transcoding.c
 */

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <libavutil/opt.h>
#include <libavutil/pixdesc.h>

static AVFormatContext *ifmt_ctx;
static AVFormatContext *ofmt_ctx;
static int disable_audio = 0;
typedef struct FilteringContext {
  AVFilterContext *buffersink_ctx;
  AVFilterContext *buffersrc_ctx;
  AVFilterGraph *filter_graph;
} FilteringContext;
static FilteringContext *filter_ctx;

typedef struct StreamContext {
  AVCodecContext *dec_ctx;
  AVCodecContext *enc_ctx;
} StreamContext;
static StreamContext *stream_ctx;

static int open_input_file(const char *filename)
{
  int ret;
  unsigned int i;

  ifmt_ctx = NULL;
  if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
    av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
    return ret;
  }

  if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
    av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
    return ret;
  }

  stream_ctx = av_mallocz_array(ifmt_ctx->nb_streams, sizeof(*stream_ctx));
  if (!stream_ctx)
    return AVERROR(ENOMEM);

  for (i = 0; i < ifmt_ctx->nb_streams; i++) {
    AVStream *stream = ifmt_ctx->streams[i];
    AVCodec *dec = avcodec_find_decoder(stream->codecpar->codec_id);
    AVCodecContext *codec_ctx;
    if (!dec) {
      av_log(NULL, AV_LOG_ERROR, "Failed to find decoder for stream #%u\n", i);
      return AVERROR_DECODER_NOT_FOUND;
    }
    codec_ctx = avcodec_alloc_context3(dec);
    if (!codec_ctx) {
      av_log(NULL, AV_LOG_ERROR, "Failed to allocate the decoder context for stream #%u\n", i);
      return AVERROR(ENOMEM);
    }
    ret = avcodec_parameters_to_context(codec_ctx, stream->codecpar);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Failed to copy decoder parameters to input decoder context "
          "for stream #%u\n", i);
      return ret;
    }
    /* Reencode video & audio and remux subtitles etc. */
    if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
        || codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
			
      if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
        codec_ctx->framerate = av_guess_frame_rate(ifmt_ctx, stream, NULL);
      /* Open decoder */
      ret = avcodec_open2(codec_ctx, dec, NULL);
      if (ret < 0) {
        av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
        return ret;
      }
    }
    stream_ctx[i].dec_ctx = codec_ctx;
  }

  av_dump_format(ifmt_ctx, 0, filename, 0);
  return 0;
}

static int open_output_file(const char *filename)
{
  AVStream *out_stream;
  AVStream *in_stream;
  AVCodecContext *dec_ctx, *enc_ctx;
  AVCodec *encoder;
  int ret;
  unsigned int i;

  ofmt_ctx = NULL;
  avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename);
  if (!ofmt_ctx) {
    av_log(NULL, AV_LOG_ERROR, "Could not create output context\n");
    return AVERROR_UNKNOWN;
  }


  for (i = 0; i < ifmt_ctx->nb_streams; i++) {
    out_stream = avformat_new_stream(ofmt_ctx, NULL);
    if (!out_stream) {
      av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
      return AVERROR_UNKNOWN;
    }

    in_stream = ifmt_ctx->streams[i];
    dec_ctx = stream_ctx[i].dec_ctx;

    if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
        || dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
      /* in this example, we choose transcoding to same codec */
	  if(dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO){
		    encoder = avcodec_find_encoder(AV_CODEC_ID_MP2);
		if(disable_audio){
			continue;
		}
	  }else{
		    encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
	  }
    
      if (!encoder) {
        av_log(NULL, AV_LOG_FATAL, "Necessary encoder not found codec_id:%d\n",dec_ctx->codec_id);
        return AVERROR_INVALIDDATA;
      }
	  av_log(NULL, AV_LOG_FATAL, "match encoder codec_id:%d\n",dec_ctx->codec_id);
      enc_ctx = avcodec_alloc_context3(encoder);
      if (!enc_ctx) {
        av_log(NULL, AV_LOG_FATAL, "Failed to allocate the encoder context\n");
        return AVERROR(ENOMEM);
      }

      /* In this example, we transcode to same properties (picture size,
       * sample rate etc.). These properties can be changed for output
       * streams easily using filters */
      if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
        enc_ctx->height = dec_ctx->height;
        enc_ctx->width = dec_ctx->width;
        enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
        /* take first format from list of supported formats */
        if (encoder->pix_fmts)
          enc_ctx->pix_fmt = encoder->pix_fmts[0];
        else
          enc_ctx->pix_fmt = dec_ctx->pix_fmt;
        /* video time_base can be set to whatever is handy and supported by encoder */
        enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
      } else {
        enc_ctx->sample_rate = dec_ctx->sample_rate;
        enc_ctx->channel_layout = dec_ctx->channel_layout;
        enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
        /* take first format from list of supported formats */
        enc_ctx->sample_fmt = encoder->sample_fmts[0];
        enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate};
      }

      /* Third parameter can be used to pass settings to encoder */
      ret = avcodec_open2(enc_ctx, encoder, NULL);
      if (ret < 0) {
        av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
        return ret;
      }
      ret = avcodec_parameters_from_context(out_stream->codecpar, enc_ctx);
      if (ret < 0) {
        av_log(NULL, AV_LOG_ERROR, "Failed to copy encoder parameters to output stream #%u\n", i);
        return ret;
      }
      if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
        enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

      out_stream->time_base = enc_ctx->time_base;
      stream_ctx[i].enc_ctx = enc_ctx;
    } else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
      av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
      return AVERROR_INVALIDDATA;
    } else {
      /* if this stream must be remuxed */
      ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
      if (ret < 0) {
        av_log(NULL, AV_LOG_ERROR, "Copying parameters for stream #%u failed\n", i);
        return ret;
      }
      out_stream->time_base = in_stream->time_base;
    }
  }
  av_dump_format(ofmt_ctx, 0, filename, 1);

  if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
    ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
      return ret;
    }
  }

  /* init muxer, write output file header */
  ret = avformat_write_header(ofmt_ctx, NULL);
  if (ret < 0) {
    av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
    return ret;
  }

  return 0;
}

static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx,
    AVCodecContext *enc_ctx, const char *filter_spec)
{
  char args[512];
  int ret = 0;
  const AVFilter *buffersrc = NULL;
  const AVFilter *buffersink = NULL;
  AVFilterContext *buffersrc_ctx = NULL;
  AVFilterContext *buffersink_ctx = NULL;
  AVFilterInOut *outputs = avfilter_inout_alloc();
  AVFilterInOut *inputs = avfilter_inout_alloc();
  AVFilterGraph *filter_graph = avfilter_graph_alloc();

  if (!outputs || !inputs || !filter_graph) {
    ret = AVERROR(ENOMEM);
    goto end;
  }

  if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
    buffersrc = avfilter_get_by_name("buffer");
    buffersink = avfilter_get_by_name("buffersink");
    if (!buffersrc || !buffersink) {
      av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
      ret = AVERROR_UNKNOWN;
      goto end;
    }

    snprintf(args, sizeof(args),
        "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
        dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
        dec_ctx->time_base.num, dec_ctx->time_base.den,
        dec_ctx->sample_aspect_ratio.num,
        dec_ctx->sample_aspect_ratio.den);

    ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
        args, NULL, filter_graph);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
      goto end;
    }

    ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
        NULL, NULL, filter_graph);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
      goto end;
    }

    ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
        (uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
        AV_OPT_SEARCH_CHILDREN);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
      goto end;
    }
  } else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
    buffersrc = avfilter_get_by_name("abuffer");
    buffersink = avfilter_get_by_name("abuffersink");
    if (!buffersrc || !buffersink) {
      av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
      ret = AVERROR_UNKNOWN;
      goto end;
    }

    if (!dec_ctx->channel_layout)
      dec_ctx->channel_layout =
        av_get_default_channel_layout(dec_ctx->channels);
    snprintf(args, sizeof(args),
        "time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64,
        dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate,
        av_get_sample_fmt_name(dec_ctx->sample_fmt),
        dec_ctx->channel_layout);
    ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
        args, NULL, filter_graph);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
      goto end;
    }

    ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
        NULL, NULL, filter_graph);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
      goto end;
    }

    ret = av_opt_set_bin(buffersink_ctx, "sample_fmts",
        (uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt),
        AV_OPT_SEARCH_CHILDREN);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
      goto end;
    }

    ret = av_opt_set_bin(buffersink_ctx, "channel_layouts",
        (uint8_t*)&enc_ctx->channel_layout,
        sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
      goto end;
    }

    ret = av_opt_set_bin(buffersink_ctx, "sample_rates",
        (uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate),
        AV_OPT_SEARCH_CHILDREN);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
      goto end;
    }
  } else {
    ret = AVERROR_UNKNOWN;
    goto end;
  }

  /* Endpoints for the filter graph. */
  outputs->name    = av_strdup("in");
  outputs->filter_ctx = buffersrc_ctx;
  outputs->pad_idx  = 0;
  outputs->next    = NULL;

  inputs->name    = av_strdup("out");
  inputs->filter_ctx = buffersink_ctx;
  inputs->pad_idx  = 0;
  inputs->next    = NULL;

  if (!outputs->name || !inputs->name) {
    ret = AVERROR(ENOMEM);
    goto end;
  }

  if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
          &inputs, &outputs, NULL)) < 0)
    goto end;

  if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
    goto end;

  /* Fill FilteringContext */
  fctx->buffersrc_ctx = buffersrc_ctx;
  fctx->buffersink_ctx = buffersink_ctx;
  fctx->filter_graph = filter_graph;

end:
  avfilter_inout_free(&inputs);
  avfilter_inout_free(&outputs);

  return ret;
}

static int init_filters(void)
{
  const char *filter_spec;
  unsigned int i;
  int ret;
  filter_ctx = av_malloc_array(ifmt_ctx->nb_streams, sizeof(*filter_ctx));
  if (!filter_ctx)
    return AVERROR(ENOMEM);

  for (i = 0; i < ifmt_ctx->nb_streams; i++) {
    filter_ctx[i].buffersrc_ctx = NULL;
    filter_ctx[i].buffersink_ctx = NULL;
    filter_ctx[i].filter_graph  = NULL;
    if (!(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
        || ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
      continue;

	if(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && disable_audio ){
		continue;
	}
    if (ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
      filter_spec = "null"; /* passthrough (dummy) filter for video */
    else
      filter_spec = "anull"; /* passthrough (dummy) filter for audio */
    ret = init_filter(&filter_ctx[i], stream_ctx[i].dec_ctx,
        stream_ctx[i].enc_ctx, filter_spec);
    if (ret)
      return ret;
  }
  return 0;
}

static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) {
  int ret;
  int got_frame_local;
  AVPacket enc_pkt;
  int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) =
    (ifmt_ctx->streams[stream_index]->codecpar->codec_type ==
     AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;

  if (!got_frame)
    got_frame = &got_frame_local;

  av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
  /* encode filtered frame */
  enc_pkt.data = NULL;
  enc_pkt.size = 0;
  av_init_packet(&enc_pkt);
    
  ret = enc_func(stream_ctx[stream_index].enc_ctx, &enc_pkt,
      filt_frame, got_frame);
  av_frame_free(&filt_frame);
  if (ret < 0)
    return ret;
  if (!(*got_frame))
    return 0;

  /* prepare packet for muxing */
  enc_pkt.stream_index = stream_index;
  av_packet_rescale_ts(&enc_pkt,
             stream_ctx[stream_index].enc_ctx->time_base,
             ofmt_ctx->streams[stream_index]->time_base);

  av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
  /* mux encoded frame */
  ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
  return ret;
}

static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
{
  int ret;
  AVFrame *filt_frame;

  av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n");
  /* push the decoded frame into the filtergraph */
  ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx,
      frame, 0);
  if (ret < 0) {
    av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
    return ret;
  }

  /* pull filtered frames from the filtergraph */
  while (1) {
    filt_frame = av_frame_alloc();
    if (!filt_frame) {
      ret = AVERROR(ENOMEM);
      break;
    }
    av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n");
    ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx,
        filt_frame);
    if (ret < 0) {
      /* if no more frames for output - returns AVERROR(EAGAIN)
       * if flushed and no more frames for output - returns AVERROR_EOF
       * rewrite retcode to 0 to show it as normal procedure completion
       */
      if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
        ret = 0;
      av_frame_free(&filt_frame);
      break;
    }

    filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
    ret = encode_write_frame(filt_frame, stream_index, NULL);
    if (ret < 0)
      break;
  }

  return ret;
}

static int flush_encoder(unsigned int stream_index)
{
  int ret;
  int got_frame;

  if (!(stream_ctx[stream_index].enc_ctx->codec->capabilities &
        AV_CODEC_CAP_DELAY))
    return 0;

  while (1) {
    av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index);
    ret = encode_write_frame(NULL, stream_index, &got_frame);
    if (ret < 0)
      break;
    if (!got_frame)
      return 0;
  }
  return ret;
}

int main(int argc, char **argv)
{
  int ret;
  AVPacket packet = { .data = NULL, .size = 0 };
  AVFrame *frame = NULL;
  enum AVMediaType type;
  unsigned int stream_index;
  unsigned int i;
  int got_frame;
  int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);

  if (argc < 3) {
    av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <output file> [-a]\n", argv[0]);
    return 1;
  }
  
  if(argc == 3){
	disable_audio = 0;  
  }else if(argc == 4 && strcmp(argv[3], "-a")){
	disable_audio = 1;  
  }
  
  if ((ret = open_input_file(argv[1])) < 0)
    goto end;
  if ((ret = open_output_file(argv[2])) < 0)
    goto end;
  if ((ret = init_filters()) < 0)
    goto end;

  /* read all packets */
  while (1) {
    if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0)
      break;
    stream_index = packet.stream_index;
    type = ifmt_ctx->streams[packet.stream_index]->codecpar->codec_type;
    av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",
        stream_index);
	if(type == AVMEDIA_TYPE_AUDIO && disable_audio){ 

	}else{
		if (filter_ctx[stream_index].filter_graph) {
		  av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n");
		  frame = av_frame_alloc();
		  if (!frame) {
			ret = AVERROR(ENOMEM);
			break;
		  }
		  av_packet_rescale_ts(&packet,
					 ifmt_ctx->streams[stream_index]->time_base,
					 stream_ctx[stream_index].dec_ctx->time_base);
		  dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 : avcodec_decode_audio4;
		  ret = dec_func(stream_ctx[stream_index].dec_ctx, frame,
			  &got_frame, &packet);
		  if (ret < 0) {
			av_frame_free(&frame);
			av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
			break;
		  }

		  if (got_frame) {
			frame->pts = frame->best_effort_timestamp;
			ret = filter_encode_write_frame(frame, stream_index);
			av_frame_free(&frame);
			if (ret < 0)
			  goto end;
		  } else {
			av_frame_free(&frame);
		  }
		} else {
		  /* remux this frame without reencoding */
		  av_packet_rescale_ts(&packet,
					 ifmt_ctx->streams[stream_index]->time_base,
					 ofmt_ctx->streams[stream_index]->time_base);

		  ret = av_interleaved_write_frame(ofmt_ctx, &packet);
		  if (ret < 0)
			goto end;
		}
		av_packet_unref(&packet);
	}
  }

  /* flush filters and encoders */
  for (i = 0; i < ifmt_ctx->nb_streams; i++) {
    /* flush filter */
    if (!filter_ctx[i].filter_graph)
      continue;
    if(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && disable_audio){
		continue;
	}
    ret = filter_encode_write_frame(NULL, i);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
      goto end;
    }

    /* flush encoder */
    ret = flush_encoder(i);
    if (ret < 0) {
      av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
      goto end;
    }
  }

  av_write_trailer(ofmt_ctx);
end:
  av_packet_unref(&packet);
  av_frame_free(&frame);
  for (i = 0; i < ifmt_ctx->nb_streams; i++) {
	if(ifmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && disable_audio){
		continue;
	}
    avcodec_free_context(&stream_ctx[i].dec_ctx);
    if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && stream_ctx[i].enc_ctx)
      avcodec_free_context(&stream_ctx[i].enc_ctx);
    if (filter_ctx && filter_ctx[i].filter_graph)
      avfilter_graph_free(&filter_ctx[i].filter_graph);
  }
  av_free(filter_ctx);
  av_free(stream_ctx);
  avformat_close_input(&ifmt_ctx);
  if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))
    avio_closep(&ofmt_ctx->pb);
  avformat_free_context(ofmt_ctx);

  if (ret < 0)
    av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret));

  return ret ? 1 : 0;
}
